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<div id="dev-warning" class="admonition note">
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  <p class="last">This document is for a development version of Ceph.</p>
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  <section id="open-policy-agent">
<h1>与 Open Policy Agent 对接<a class="headerlink" href="#open-policy-agent" title="Permalink to this heading"></a></h1>
<p>Open Policy Agent (OPA) is a lightweight general-purpose policy engine
that can be co-located with a service. OPA can be integrated as a
sidecar, host-level daemon, or library.</p>
<p>Services can offload policy decisions to OPA by executing queries. Hence,
policy enforcement can be decoupled from policy decisions.</p>
<section id="opa">
<h2>配置 OPA<a class="headerlink" href="#opa" title="Permalink to this heading"></a></h2>
<p>To configure OPA, load custom policies into OPA that control the resources users
are allowed to access. Relevant data or context can also be loaded into OPA to make decisions.</p>
<dl class="simple">
<dt>Policies and data can be loaded into OPA in the following ways::</dt><dd><ul class="simple">
<li><p>OPA’s RESTful APIs</p></li>
<li><p>OPA’s <em>bundle</em> feature that downloads policies and data from remote HTTP servers</p></li>
<li><p>Filesystem</p></li>
</ul>
</dd>
</dl>
</section>
<section id="ceph">
<h2>配置 Ceph 对象网关<a class="headerlink" href="#ceph" title="Permalink to this heading"></a></h2>
<p>The following configuration options are available for OPA integration:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">rgw</span> <span class="n">use</span> <span class="n">opa</span> <span class="n">authz</span> <span class="o">=</span> <span class="p">{</span><span class="n">use</span> <span class="n">opa</span> <span class="n">server</span> <span class="n">to</span> <span class="n">authorize</span> <span class="n">client</span> <span class="n">requests</span><span class="p">}</span>
<span class="n">rgw</span> <span class="n">opa</span> <span class="n">url</span> <span class="o">=</span> <span class="p">{</span><span class="n">opa</span> <span class="n">server</span> <span class="n">url</span><span class="p">:</span><span class="n">opa</span> <span class="n">server</span> <span class="n">port</span><span class="p">}</span>
<span class="n">rgw</span> <span class="n">opa</span> <span class="n">token</span> <span class="o">=</span> <span class="p">{</span><span class="n">opa</span> <span class="n">bearer</span> <span class="n">token</span><span class="p">}</span>
<span class="n">rgw</span> <span class="n">opa</span> <span class="n">verify</span> <span class="n">ssl</span> <span class="o">=</span> <span class="p">{</span><span class="n">verify</span> <span class="n">opa</span> <span class="n">server</span> <span class="n">ssl</span> <span class="n">certificate</span><span class="p">}</span>
</pre></div>
</div>
</section>
<section id="rgw-opa">
<h2>RGW-OPA 是如何对接的<a class="headerlink" href="#rgw-opa" title="Permalink to this heading"></a></h2>
<p>After a user is authenticated, OPA can be used to check if the user is authorized
to perform the given action on the resource. OPA responds with an allow or deny
decision which is sent back to the RGW which enforces the decision.</p>
<p>请求实例：</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">POST</span> <span class="o">/</span><span class="n">v1</span><span class="o">/</span><span class="n">data</span><span class="o">/</span><span class="n">ceph</span><span class="o">/</span><span class="n">authz</span> <span class="n">HTTP</span><span class="o">/</span><span class="mf">1.1</span>
<span class="n">Host</span><span class="p">:</span> <span class="n">opa</span><span class="o">.</span><span class="n">example</span><span class="o">.</span><span class="n">com</span><span class="p">:</span><span class="mi">8181</span>
<span class="n">Content</span><span class="o">-</span><span class="n">Type</span><span class="p">:</span> <span class="n">application</span><span class="o">/</span><span class="n">json</span>

<span class="p">{</span>
    <span class="s2">&quot;input&quot;</span><span class="p">:</span> <span class="p">{</span>
        <span class="s2">&quot;method&quot;</span><span class="p">:</span> <span class="s2">&quot;GET&quot;</span><span class="p">,</span>
        <span class="s2">&quot;subuser&quot;</span><span class="p">:</span> <span class="s2">&quot;subuser&quot;</span><span class="p">,</span>
        <span class="s2">&quot;user_info&quot;</span><span class="p">:</span> <span class="p">{</span>
            <span class="s2">&quot;user_id&quot;</span><span class="p">:</span> <span class="s2">&quot;john&quot;</span><span class="p">,</span>
            <span class="s2">&quot;display_name&quot;</span><span class="p">:</span> <span class="s2">&quot;John&quot;</span>
        <span class="p">},</span>
        <span class="s2">&quot;bucket_info&quot;</span><span class="p">:</span> <span class="p">{</span>
            <span class="s2">&quot;bucket&quot;</span><span class="p">:</span> <span class="p">{</span>
                <span class="s2">&quot;name&quot;</span><span class="p">:</span> <span class="s2">&quot;Testbucket&quot;</span><span class="p">,</span>
                <span class="s2">&quot;bucket_id&quot;</span><span class="p">:</span> <span class="s2">&quot;testbucket&quot;</span>
            <span class="p">},</span>
            <span class="s2">&quot;owner&quot;</span><span class="p">:</span> <span class="s2">&quot;john&quot;</span>
        <span class="p">}</span>
    <span class="p">}</span>
<span class="p">}</span>
</pre></div>
</div>
<p>响应：</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="p">{</span><span class="s2">&quot;result&quot;</span><span class="p">:</span> <span class="n">true</span><span class="p">}</span>
</pre></div>
</div>
<p>The above is a sample request sent to OPA which contains information about the
user, resource and the action to be performed on the resource. Based on the polices
and data loaded into OPA, it will verify whether the request should be allowed or denied.
In the sample request, RGW makes a POST request to the endpoint <em>/v1/data/ceph/authz</em>,
where <em>ceph</em> is the package name and <em>authz</em> is the rule name.</p>
</section>
</section>



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